Pump jack



1,627,708 M J. A. LUND PUMP JACK May 1o, 1927.-

Fled Out. 18, 1925 VE l DE 4/0/272 zal und ay 1G, 1927.

ifzarsi PATENT OFFICE.

'JOHN AUGUST LUND, OF BATAVIA, ILLINOIS, A SSIGNOR T0 CHALLENGE COMPANY,

OF BATAVIA, ILLINOIS, A CORPORATION OF ILLINOIS.

PUMP JACK.

Application led October 18, 1926. Serial No. 142,326.

rlhis invention relates to pump jacks and more particularly to 'gear mountings therefor, although it may be employed with equal advantage for other purposes.

It contemplates more especially the provision of a simple mounting bracket particularly adapted to retain relatively moving members against displacement. y

Numerousexpedients have heretofore been resorted to in an eHort to retain coacting elements against displacement, especially meshing gears which necessarily must be in alignment to effect `smooth performance free from vibration. lDevices` of known construction have not proven entirely satisfactory due to their complex and expensive construction, as well as their .inability to withstand appreciable thrust, there being considerable friction present between the coacting elements which results in excessive wear.

One object of the present invention is to. simplify and improve the construction of devices of the character mentioned.

Another object is to provide simple'and durable means for maintaining coacting, relatively movable members against displacement.

A further object is to provide means for maintaining relatively movable members in spaced relation. v

Other objects and advantages will appear from the following description of an illustrated embodiment of the present invention.

In the drawings:

Figure 1 is a plan view of a device embodying features of the present invention.

Figure 2 is a sectional view taken substantially along line II-II of Figure 1.

Figure 3 is a sectional view taken substantially along line III-III of Figure 1.

Figure 4 is a view in elevation of thej structure disclosed in Figure 1, there being g a cover guard provided to prevent accidental contact with the moving elements.

Figure 5 is a sectional' view taken substantially along line V-V of Figure 1.

The structure selected for illustration comprises a casing 10 shaped in the form of a suitable receptacle to receive a lubricant therein. A tubular standard 11 of any appropriate shape is ntegrall associated'wth the casing 10 to support t e latter in any suitable position. A standard or mounting bracket 12 is, in this instance, formed integrally with the. interior of the casing 10 and projects upwardly therefrom to provide a support for a pair of vertically disposed, parallel spaced guide rods 13 and 14 which have threaded extremities 15 and 16, respectively, to engage appropriate threaded apertures provided in the standard 12. The other extremities of the guide rods13 and 14 are maintained in spaced relation by means of a bracket 17 suitably apertured as at 18 and 19 to receive the ends of the guide rods 13 and 14, they being maintained therein by means of the set screws 2() and 21 of standard construction.

It is to be noted that the guide rods 13 and 14 are so spaced with respect to the tubular supporting standard 11 so that the axis of the latter will coincide with the median line of the guide rods 13 and 14. The standard 12 is bored as at 22 in coaxial relation with the tubular standard 11 to receive a pump rod 23 reciprocal therein. Secured to the upper extremity of the pump rod 23 is a saddle 24 suitably bored to Support a horizontally disposed shaft 25 therein upon which a peripherally grooved guide roller 26 is journalled to coact with and rotate between the guide rods 13 and 14, thereby serving to govern the movement of the pump rod 23.

Reciprocation is imparted to the pump rod 23 by means of a pair of spaced crank arms 27 and 28 which are .pivotally associated with the extremities of the guide roller shaft 25. The standard 12 is provided with a horizontally disposed bore 29 within which is fixed a shaft 30 centrally supported to provide extensions on either side of the standard 12 to support thereon a' pair of spaced spur gears 31 and 32. The other extremities of the crank arms 27 yand28 are pivotally associated with the gears 31 and 32, respectively, near the periphery thereof by means of the st ud shafts 33 and 34 projecting through suitable apertures provided, in this instance, in one of the spokes of each of the gears 31 and 32. Thus rotation of the gears 31 and 32 will impart reciprocation to the pump rod 23 thereby eiecting rotation of the guide roller 26, it being in frictional contact with the guide rods 13 and 14. Rotation is imparted to the gears 31 and 32, in this instance, by means of a. power shaft 35 suitably journalled in appropriate bearings provided in the casing 10 so as to support thereon within the casing 10, a pair of pinions 36 and 37 which are spaced to correspond with the distance between the gears 31 and 32 respectivelyr with which they are meshed to create a driving connection between the driv- .ing shaft 35'Ja'nd the pump rod 23 as will be apparent from the showing.

Obviously, the gears' 31 and 32 must be maintained in alignmentwvith the pinions 36 and 37 so as to properly mesh therewith at all times. Numerous expedients may be employed to .maintain the gears 31 and 32 in their proper spaced relation withoutfnausing appreciable wear on the coacting elements. rlhe novel means employed, in this instance, comprises the provision of va gear hub 38 having a flanged extremity 39 to define a peripheral shoulder adjacent the standard 12. Since two gears are employed in the present embodiment, both are provided with the structure hereinabove described so as to provide spaced shoulders 39 on either side of the standard 12. To maintain the fianges 39 in spaced relation without permitting axial displacement of the gears 31 and 32, a clip 40 is provided, which, in this instance, comprises a substantially rectangular metallic plate bent at the extremities thereof to define a depending lug, in this instance two, herein designated by numerals 41 and 42, adapted to cooperate with the peripheral flanges 39 of the gear hubs 38 to maintain them against the standard 12 whereby outward axial displacement of the gears is prevented. The ings 41 and 42 which cooperate with the surface of the hubs 38 are preferably provided with an arcuate surface 43 (Figure 5) to contact with the hub periphery to permit relatively vslidable movement therebetween, as well as to present a lateral bearing surface of appreciable ma nitude to withstand lateral stresses to whichfthe clip may be subjected.

t is 4apparent that the clip 40 may be fixed-to the standard in any suitable positioii however, in the esent embodiment the clin is detachably fixed to the surface ot' the standard 12 which is in proximity tothe peripheral flanges lof the gear hubs so that th'e lu s 41 and 42 need not be of any apprecia le length. 'llhe clip 40 is xed'to the standard 12, in this instance, by means o f a threaded stud 44 of standard construction projecting through a suitable aperture in the clip and having threaded engagement with the standard 12 in the usual manner. A lock nut 45 is threaded to the shank of the stud 44 to rigidly maintain the' clip 41 on the standard 12, it being obvious that the clip may be readily removed with the arrangement of parts above described. It is worthy of note that the clip may be of' any form and have any number of depending lugs thereon to cooperate with a corresponding number of gears or other relatively coacting members desired'to be maintained in spaced relation without any possible axial displaceii'ieiit. The casing 10 is provided with a threaded aperture 46 coaxial with the shaft 30 to permit the standard 12 to be suitably bored 'from' the exterior of the casing. The aperture 46 may be provided with a threaded plug 47*y in threaded engagement with the aperture' 46 to prevent the escape of lubricant therethrough'.

l am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing vfrom the principles of this invention, and l therefore do not purpose limiting the patent granted hereon, other- Wise than necessitated by the prior art.

l claim as my invention:

1. The combination' with a pump jack comprising a reciprocable member, driving gears operatively connected to said member, a standard for supporting said gears, a shaft fixed in said standard, said gears being mounted on said shaft on either side of said standard, a clip lixed to said standard, and cooperating means associated with said clip and gears to insure against axial displacement of said ears.

2. The com ination with a standard, of a shaftprojecting from the sides of said standard, a pair of: gears on said shaft spaced to receive said standard therebetween, said gears having flanged hubs adjacent said standard, anda clip removably mounted on said standard, said clip having depending extremities engaging said flanges to maintain said gears in spaced relation.

1n testimony whereof l have hereunto subscribed my name.

JOHN AUGUST HUND.. 

